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+\documentclass{article}
+\setlength{\textwidth}{135mm}
+\begin{document}
+\setcounter{equation}{2}
+\begin{equation}
+S(z) = -\cos\left(\frac{\pi}{2} z^2\right) \sum_{n=0}^\infty
+ \frac{(-1)^n\pi^{2n+1}}{1\cdot3\cdots(4n+3)} z^{4n+3}
+ +\sin\left(\frac{\pi}{2} z^2\right) \sum_{n=0}^\infty
+ \frac{(-1)^n\pi^{2n}}{1\cdot3\cdots(4n+1)} z^{4n+1}
+\end{equation}
+\end{document}
+